DiffAggregatorTest.java

package org.kairosdb.core.aggregator;

import org.junit.Test;
import org.kairosdb.core.DataPoint;
import org.kairosdb.core.datapoints.DoubleDataPointFactoryImpl;
import org.kairosdb.core.datapoints.LongDataPoint;
import org.kairosdb.core.datastore.DataPointGroup;
import org.kairosdb.testing.ListDataPointGroup;

import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.assertThat;

/**
 Created by bhawkins on 1/8/15.
 */
public class DiffAggregatorTest
{
	@Test(expected = NullPointerException.class)
	public void test_nullSet_invalid()
	{
		new DiffAggregator(new DoubleDataPointFactoryImpl()).aggregate(null);
	}

	@Test
	public void test_steadyRate()
	{
		ListDataPointGroup group = new ListDataPointGroup("rate");
		group.addDataPoint(new LongDataPoint(1, 10));
		group.addDataPoint(new LongDataPoint(2, 20));
		group.addDataPoint(new LongDataPoint(3, 30));
		group.addDataPoint(new LongDataPoint(4, 40));

		DiffAggregator DiffAggregator = new DiffAggregator(new DoubleDataPointFactoryImpl());
		DataPointGroup results = DiffAggregator.aggregate(group);

		DataPoint dp = results.next();
		assertThat(dp.getTimestamp(), equalTo(2L));
		assertThat(dp.getDoubleValue(), equalTo(10.0));

		dp = results.next();
		assertThat(dp.getTimestamp(), equalTo(3L));
		assertThat(dp.getDoubleValue(), equalTo(10.0));

		dp = results.next();
		assertThat(dp.getTimestamp(), equalTo(4L));
		assertThat(dp.getDoubleValue(), equalTo(10.0));

		assertThat(results.hasNext(), equalTo(false));
	}

	@Test
	public void test_changingRate()
	{
		ListDataPointGroup group = new ListDataPointGroup("rate");
		group.addDataPoint(new LongDataPoint(1, 10));
		group.addDataPoint(new LongDataPoint(2, 10));
		group.addDataPoint(new LongDataPoint(3, 5));
		group.addDataPoint(new LongDataPoint(4, 20));

		DiffAggregator DiffAggregator = new DiffAggregator(new DoubleDataPointFactoryImpl());
		DataPointGroup results = DiffAggregator.aggregate(group);

		DataPoint dp = results.next();
		assertThat(dp.getTimestamp(), equalTo(2L));
		assertThat(dp.getDoubleValue(), equalTo(0.0));

		dp = results.next();
		assertThat(dp.getTimestamp(), equalTo(3L));
		assertThat(dp.getDoubleValue(), equalTo(-5.0));

		dp = results.next();
		assertThat(dp.getTimestamp(), equalTo(4L));
		assertThat(dp.getDoubleValue(), equalTo(15.0));

		assertThat(results.hasNext(), equalTo(false));
	}


	@Test
	public void test_steadyRateOver2Sec()
	{
		ListDataPointGroup group = new ListDataPointGroup("rate");
		group.addDataPoint(new LongDataPoint(1, 10));
		group.addDataPoint(new LongDataPoint(3, 20));
		group.addDataPoint(new LongDataPoint(5, 30));
		group.addDataPoint(new LongDataPoint(7, 40));

		DiffAggregator rateAggregator = new DiffAggregator(new DoubleDataPointFactoryImpl());
		DataPointGroup results = rateAggregator.aggregate(group);

		DataPoint dp = results.next();
		assertThat(dp.getTimestamp(), equalTo(3L));
		assertThat(dp.getDoubleValue(), equalTo(10.0));

		dp = results.next();
		assertThat(dp.getTimestamp(), equalTo(5L));
		assertThat(dp.getDoubleValue(), equalTo(10.0));

		dp = results.next();
		assertThat(dp.getTimestamp(), equalTo(7L));
		assertThat(dp.getDoubleValue(), equalTo(10.0));

		assertThat(results.hasNext(), equalTo(false));
	}


	@Test
	public void test_dataPointsAtSameTime()
	{
		ListDataPointGroup group = new ListDataPointGroup("rate");
		group.addDataPoint(new LongDataPoint(1, 10));
		group.addDataPoint(new LongDataPoint(1, 15));
		group.addDataPoint(new LongDataPoint(2, 5));
		group.addDataPoint(new LongDataPoint(2, 20));
		group.addDataPoint(new LongDataPoint(3, 30));


		DiffAggregator DiffAggregator = new DiffAggregator(new DoubleDataPointFactoryImpl());
		DataPointGroup results = DiffAggregator.aggregate(group);

		assertThat(results.hasNext(), equalTo(true));
		DataPoint dp = results.next();
		assertThat(dp.getTimestamp(), equalTo(1L));
		assertThat(dp.getDoubleValue(), equalTo(5.0));

		assertThat(results.hasNext(), equalTo(true));
		dp = results.next();
		assertThat(dp.getTimestamp(), equalTo(2L));
		assertThat(dp.getDoubleValue(), equalTo(-10.0));

		assertThat(results.hasNext(), equalTo(true));
		dp = results.next();
		assertThat(dp.getTimestamp(), equalTo(2L));
		assertThat(dp.getDoubleValue(), equalTo(15.0));

		assertThat(results.hasNext(), equalTo(true));
		dp = results.next();
		assertThat(dp.getTimestamp(), equalTo(3L));
		assertThat(dp.getDoubleValue(), equalTo(10.0));

		assertThat(results.hasNext(), equalTo(false));
	}
}